|
Asthma severity indicators
|
Vitamin D
|
Difference in mean Vitamin D levels between negative and positive response
|
|---|
|
Mean levels
|
|---|
|
Ng/mL (SD)
|
(Reference Group: Negative)
§
|
|---|
|
n = 69±
|
b coefficient (95% CI); p value
|
|---|
|
Model 1*
|
Model 2*
|
|---|
|
Asthma attacks in the last 12 months
|
|
No
|
59.4%
|
21.58 (5.54)
|
−3.10
|
−3.05
|
|
Yes
|
40.6%
|
19.41 (5.40)
|
(−5.80, −0.41); p = 0.03
|
(−6.07, −0.04); p = 0.05
|
|
Asthma medication use
|
|
No
|
62.3%
|
21.38 (5.31)
|
−2.00
|
−1.80
|
|
Yes
|
37.7%
|
19.35 (5.78)
|
(−4.92, 0.92); p = 0.18
|
(−4.82, 1.22); p = 0.24
|
|
Hospital admission
|
|
No
|
82.2%
|
21.07 (5.28)
|
−2.90
|
−2.40
|
|
Yes
|
18.8%
|
18.52 (6.45)
|
(−6.18, 0.67); p = 0.11
|
(−6.13, 1.34); p = 0.20
|
|
Emergency room visit
|
|
No
|
65.2%
|
21.77 (5.04)
|
−3.43
|
−3.76
|
|
Yes
|
34.8%
|
18.72 (5.89)
|
(−6.18, −0.67); p = 0.02
|
(−6.74, −0.79); p = 0.01
|
|
Asthma severity index
|
|
No Positive Answers
|
29.5%
|
22.62 (4.84)
|
−1.51†
|
−1.55†
|
|
1 Positive Answer
|
26.2%
|
21.13 (5.57)
|
(−2.64, −0.37); p = 0.01
|
(−2.78, −0.33); p = 0.01
|
|
2 Positive Answers
|
23.0%
|
19.75 (5.28)
| | |
|
3 Positive Answers
|
16.4%
|
18.50 (6.18)
| | |
|
4 Positive Answers
|
4.9%
|
16.43 (6.58)
| | |
- Notes: §b coefficients correspond to difference in mean vitamin D levels as estimated in linear regression models. *Model 1adjusted for seasonality. Model 2 further adjusting for gender, family history of Allergies, body fat %, smoking status and parental education. ±Missing data ranged from 0–8. †Change in mean vitamin D levels per 1 unit change in asthma severity index (i.e. across increasing categories of severity).
